[Aavso-photometry] Calibration Frames

[Derek C Breit]

>From various sources (People, Books, and the Internet) I am getting answers
with a very large sigma to this question..
 
( I know the answers will include "It depends on the target".. Please don't
confuse me, unless it is essential because I am completely off base. 
I of course would like to know, but try and separate the response into Part
one and Part Two.. :-)   )
 
How Many Calibration frames do you use to make Master Calibration Frames??
 
I have heard anywhere from 4 to 20, though 16 seems to be a common answer..
 
Then I heard take twice as many Flats as darks.. Then I heard 3x the Flats..
 
So.. What do YOU do and Why??? 
 
Thanks in advance..
 
Derek